Grind flaxseed so it's still crunchy but not flour.
Combine all dry ingredients and mix well. Combine eggs and buttermilk in a separate bowl and whisk to incorporate well. Combine dry and wet, mix well but don't overmix. A couple small lumps are ok.
Heat griddle and spray. Using a ladle make equal 8 pancakes and let cook until bubbles form on top, about 3 minutes. Flip and cook about 2 more minutes. Serve warm with maple syrup or toppings of choice.